224 M. Vauthier on a new Species of Epeira. 



poda, this genus should be placed in that of the Monothalamous 

 Cephalopoda, near the Argonantgs, whose characters, as given by 

 M. Lamarck, cannot apply to it, since the shell of the latter is 

 very thin, whilst that of the Bellerophontes is very thick, and 

 instead of the double keel of the Argonautae, we find in the 

 middle of the back of the Bellerophontes a single keel, dividing 

 the shell into two equal parts. The latter differ moreover from 

 the former, in the whorles of the spire being very numerous, 

 whereas the Argonautaj are curved, but not convolute, so that 

 nearly the whole of the shell is perceptible, the summit of which 

 is extraordinarily obtuse. 



The Argonautae and the Bullae are the shells which the Belle- 

 rophontes appear to resemble most, but still differ from them so 

 much, that it seems right to form the latter into a separate genus. 

 In that case they may be described by the following characters : 

 Shell free, univalve, not chambered, spirallij convolute, depressed, 

 shuttle-shaped? (formant la navette) — the last whorle of the 

 sj)ire inclosing all the rest ; aperture very ovaly receiving^ in the 

 middle part, the back of the shell. 



A iiT. XXVI. Description of a new species ofArachnides, of 

 the Genus Epeira, ofM. Walckenaer. Bt/ C.Vautiheb,*. 



[With a Plate.] 



This new species of Arachnides, originally from Java, which I 

 shall describe under the name of Epeira ciirvicauda, was commu- 

 nicated to me by M. Lemau. Its singular organization, and the 

 perfect state in which it is preserved, have determined me to make 

 an analytical drawing of it, and to publish its description. 



Not having found in the collection of the Museum of Natural 

 History, which I have carefully examined, nor in the authors 

 whom I have consulted, any individual perfectly identical with 



* Translattid fioin the Annalcs des Sciences Naturcllcs, vol. i. p. 361. 



